Telephone-transmitter.



PATENTED MAR. 22. 904.

J. A. WILLIAMS. TELEPHONE TRANSMITTER.

APPLIOATTON FILED APR. 1p, 1903.

' I INVENTOH L Arron/v5);

No. mom.

UNITED "ST TES Patented March 22, 1904.

PATENT OFFICE.

JOSEPH A. WILLIAMS, OF CLEVELAND, OHIO, ASSIGNOR TO THE WIL- LIAMS TELEPHONE & SUPPLY COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF WEST VIRGINIA.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 755,091, dated March 22, 1904.

Application filed April in, 1903.

To all whom it may concern.- 7

Be it known that I, JosErH A. WVILLIA s, a citizen of the United, States of America, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Telephone-Transmitters; and I hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates to improvements in a telephone-transmitter.

The object of this invention'is to provide a device of this character which will be very sensitive to the action of sound-waves and which will not be afl'ected by changes of temperature.

-- My invention therefore consists in provid ing new and improved means for supporting the carbon-receptacle, so that it will be self adjusting and accommodate itself to any change in the position of the diaphragm or any inequality or irregularity in the retainingring in order that it will at all times be in perfect alinement with the diaphragm.

My invention therefore consists in the features of construction and combination of parts hereinafter described in the specification,.

pointed out in the claims, and illustrated in' the drawings.

In the accompanying drawings, Figure 1 is acentral section of my device. Fig.2 is a bottom plan of the same.

Again referring to the drawings, a represents an annular casing, in the center of which is formed an opening at, around which on the outer surface of the casing a is formed an annular eXteriorlyscrew+threadedflange a To the flange a is screwed a mouthpiece 6, provided with a perforated disk 0 at its inner end of the usual construction. In the casing a near its rim is formed an annular shoulder cl, which constitutes the seat for the diaphragm e, by means of which the said diaphragm is supported from the said casing a, so that practically its entire surface is exposed to the action of the sound-waves Within the casing 60 is arranged a ring f, which is secured in the Serial No. 151,985. (No model.)

casing 64 and clamped against the diaphragm e by means of screws f. At diametrically opposite points on said ring f are arranged arms f and f respectively, preferably formed integral with the said ring. On the outer ends of the respective arms f and f are formed flanges f* and f respectively, arranged at right angles to the said arms. A bridge 9 extends between the arms f and f and is secured to the respective flanges f and f by means of screws g and g The screws g and g are insulated from the respective flanges f and f by means of insulating-rings h, and

the-bridge g is also insulated from the respecin use and will therefore offer very slight resistance to the vibration of the diaphragm.

.In the center of the plate 2' is arranged a cone-shaped projection 2' which is preferably providedv with a head 2. A spring is is secured at one end to the bridge 9 bya screw 70' and in its other end is formed an eye k adapted to slip over the end of the stud i The arrangement of the cone-shaped projection and the eye k in the end of the spring it constitutes what might be termed a universal bearing between the spring 0 and the carbon-receptacle, which allows the said receptacle to aline itself evenly against the diaphragm and compensate for. any irregularity in the retaining-ring or in themounting of the diaphragm.

An adjusting-screw Z is mounted in the bridge 9 and arranged to come into contact with the head i of the stud 2' A pad Z, of felt or similar material, is arranged between said head i and the end of the screw Z. This screw acts as a damper to limit the vibration of the carbon-receptacle, thereby preventing a confusion of sounds.

Now it is well known that the casing of the transmitter being made of metal contracts and expands with changes of temperature; but the ratio of expansion of the casing is much greater than that of the carbon diaphragm, and therefore when the casing contracts the carbon diaphragm will be too large, and a contraction of the casing will cause the diaphragm to be sprung at its center and in the line of least resistance, which will be away from the carbon-receptacle, and therefore the diaphragm will be concave toward the carbonreceptacle. Now if the carbon receptacle were held stationary this concavity of the diaphragm would in extreme cases produce a separation between the carbon-receptacle and the diaphragm and allow the pulverized carbon to sift down between the diaphragm and the retaining-ring and in all cases would cause a temporary enlargement of the carbon-receptacle, and the pulverized carbon will accommodate itself to the enlarged chamber and move down into the lower part thereof; but on the expansion of the casing when the diaphragm assumes its normal position the carbon-receptacle will be reduced to its original size and the carbon will be compressed in the lower part thereof to such an extent that it will be no longer sensitive to the vibrations of the diaphragm.

By my means of flexibly mounting and supporting the carbon-receptacle by means of the universal bearing the said carbon-receptacle automatically adjusts itself and alines itself with the diaphragm under all conditions, and the said carbon-receptacle is caused to maintain a constant relation with the diaphragm, so that the retaining-ring will always be in contact with the said diaphragm and the carbon-receptacle will never become abnormally enlarged, but the maximum capacity thereof will remain constant.

I" hat I claim is 1. In atelephone-transmitter, the combination of a mouthpiece, a casing, a diaphragm arranged in said casing, a plate, an annular flange formed integral with said plate, and arranged at a greater distance from the face of the said diaphragm than the said plate is from said diaphragm, a retaining and cushioning ring arranged between said flange and said diaphragm and a quantity of pulverized carbon arranged between said plate and said diaphragm, substantially as described and for the purpose set forth.

2. In a telephone-transmitter the combination of a mouthpiece, a casing, a diaphragm arranged in said casing, a carbon-receptacle, a cone-shaped stud formed on the outer surface of said receptacle, a bridge spanning said casing, and a flat spring secured at one end to said bridge and having an eye formed in its other end and arranged to receive the end of the cone-shaped stud.

3. In a telephone-transmitter, the combination of a mouthpiece, a casing, a diaphragm arranged in said casing, a ring secured in said casing for holding said diaphragm in position, arms formed integral with said ring at diametrically opposite sides thereof, a bridge spanning said arms, a carbon-receptacle, a cone-shaped stud formed on the exterior of said carbon-receptacle, a springsecured at one end to said bridge and having an eye formed on the other end adapted to receive the end of said stud, a head formed on said stud, a screw arranged in said bridge in line with the said head and a cushion arranged between said head and said screw, substantially as described.

I. In a telephone-transmitter, the combination of a mouthpiece, a casing, a diaphragm arranged in said casing, a carbon-receptacle, a cone-shaped stud formed on the exterior surface of said carbon-receptacle, a spring secured at one end to said casing and having a socket formed in its other end adapted to receive the end of the stud, a head formed on the end of saidstud, a cushioning-pad secured on the end of said head and an adjustable screw secured in said casing in line with said head, substantially as described.

5. In a telephone-transmitter the combination of a mouthpiece, a casing, a diaphragm arranged in said casing, a carbon-receptacle, a cone-shaped stud formed on the outer surface of said receptacle, a bridge spanning said casing and a spring secured at one end to said bridge and having its other end arranged to form a universal bearing for said cone-shaped stud.

In testimony whereof I sign the foregoing specification, in the presence of two witnesses, this 4th day of April, 1903, at Cleveland,Ol1io.

JOSEPH A. WILLIAMS.

Witnesses:

VICTOR O. LYNCH, Gr. M. HAYES. 

